Loans (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	$ 6,697	$ 3,931
Unpaid Principal Balance	12,412	11,385
Recorded Investment
Recorded Investment, With no related allowance recorded	6,123	3,452
Recorded Investment	11,376	10,355
Allowance for Loan Losses Allocated
Allowance for Loan Losses Allocated	180	985
Information for impaired loans
Average Recorded Investment, With no related allowance recorded	3,909	3,954
Average Recorded Investment	10,767	11,449	7,755
Commercial Real Estate [Member]
Unpaid Principal Balance
Unpaid Principal Balance, With an allowance recorded	5,715	7,454
Recorded Investment
Recorded Investment, With an allowance recorded	5,253	6,903
Allowance for Loan Losses Allocated
Allowance for Loan Losses Allocated	180	985
Information for impaired loans
Average Recorded Investment, With an allowance recorded	6,858	7,495
Commercial real estate, Owner occupied [Member]
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	3,916	884
Unpaid Principal Balance, With an allowance recorded	2,207	4,721
Recorded Investment
Recorded Investment, With no related allowance recorded	3,481	762
Recorded Investment, With an allowance recorded	2,169	4,169
Allowance for Loan Losses Allocated
Allowance for Loan Losses Allocated	59	309
Information for impaired loans
Average Recorded Investment, With no related allowance recorded	1,490	844
Average Recorded Investment, With an allowance recorded	3,859	4,316
Commercial real estate, Non-owner occupied [Member]
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	560	430
Unpaid Principal Balance, With an allowance recorded	2,560	2,455
Recorded Investment
Recorded Investment, With no related allowance recorded	461	340
Recorded Investment, With an allowance recorded	2,424	2,456
Allowance for Loan Losses Allocated
Allowance for Loan Losses Allocated	70	439
Information for impaired loans
Average Recorded Investment, With no related allowance recorded	483	443
Average Recorded Investment, With an allowance recorded	2,402	2,883
Commercial real estate, Other[Member]
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	0	800
Unpaid Principal Balance, With an allowance recorded	0
Recorded Investment
Recorded Investment, With no related allowance recorded	0	590
Recorded Investment, With an allowance recorded	0
Allowance for Loan Losses Allocated
Allowance for Loan Losses Allocated	0
Information for impaired loans
Average Recorded Investment, With no related allowance recorded	114	767
Average Recorded Investment, With an allowance recorded	119
Commercial [Member]
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	1,250	1,122
Unpaid Principal Balance, With an allowance recorded	948	278
Recorded Investment
Recorded Investment, With no related allowance recorded	1,192	1,063
Recorded Investment, With an allowance recorded	660	278
Allowance for Loan Losses Allocated
Allowance for Loan Losses Allocated	51	237
Information for impaired loans
Average Recorded Investment, With no related allowance recorded	1,075	1,203
Average Recorded Investment, With an allowance recorded	478	296
Residential real estate, 1-4 family residential [Member]
Unpaid Principal Balance
Unpaid Principal Balance, With no related allowance recorded	971	695
Recorded Investment
Recorded Investment, With no related allowance recorded	989	697
Information for impaired loans
Average Recorded Investment, With no related allowance recorded	$ 747	$ 697